1. Doing a Factory Reset using Settings (if phone IS working and you CAN use it) Follow these simple steps to Hard Reset HTC One X from Settings. Go to Settings , and locate the option Backup and reset. Now, tap on Factory Data Reset. It will list all the details in very brief. Now, tap on the Reset device to start the Hard Reset on your HTC One X.
Low charge on battery. If the charge in your battery is too low, it will not power the phone. The first thing to try when you phone won’t turn on, is to charge your battery. Plug the phone into your wall outlet and leave for 10 minutes, then try to turn it on again. If that does not work, leave for another 20 minutes and try to power on.
Power down your phone. Turn it back on and boot into Recovery mode. This is a bit different for every phone, so you'll have to Google how to do it for your specific model. Usually it involves holding down another button, like Volume Down, as you turn your phone on. HTC phones will have to then select "Recovery" from a menu, while other phones
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